package com.atguigu.web;

import com.atguigu.pojo.User;
import com.atguigu.service.UserService;
import com.atguigu.service.UserServiceImpl;
import com.atguigu.utils.WebUtils;
import com.google.gson.Gson;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import static com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY;

public class UserServlet extends BaseServlet{
    private UserService userService=new UserServiceImpl();

    protected void ajaxExistsusername(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{
        //获取请求的参数username
        String username=req.getParameter("username");
        //调用userService.existsUsername();
        boolean existsUsername = userService.existsUsername(username);
        //把返回的结果封装成为map对象
        Map<String,Object> resultMap=new HashMap<>();
        resultMap.put("existsUsername",existsUsername);

        Gson gson=new Gson();
        String json = gson.toJson(resultMap);
        resp.getWriter().write(json);
    }

    /**
     * 注销
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void logout(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{
        //1.销毁Session中用户登录的信息（或者销毁Session）
        req.getSession().invalidate();
        //2.重定向到首页（或登录页面）
        resp.sendRedirect(req.getContextPath());
    }

    /**
     * 处理登陆的功能
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void login(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{
        //获取请求的参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        User loginuser = userService.login(new User(null, username, password, null));

        //如果等于null登录失败
        if(loginuser==null){
            //把错误信息和回显的表单信息，保存到Request域中
            req.setAttribute("msg","用户或密码错误！");
            req.setAttribute("username",username);
            //跳回登录页面
            req.getRequestDispatcher("/pages/user/login.jsp").forward(req,resp);
        }else{
            //登录成功
            //保存用户登录的信息到Session域中
            req.getSession().setAttribute("user",loginuser);
            //跳到登录成功页面
            req.getRequestDispatcher("/pages/user/login_success.jsp").forward(req,resp);
        }

    }

    /**
     * 处理注册的功能
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void regist(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{
        //获取Session中的验证码
        String token = (String) req.getSession().getAttribute(KAPTCHA_SESSION_KEY);
        //删除Session中的验证码
        req.getSession().removeAttribute(KAPTCHA_SESSION_KEY);

        //1.获取请求的参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String email = req.getParameter("email");
        String code = req.getParameter("code");

        Map<String, String[]> parameterMap = req.getParameterMap();
        for(Map.Entry<String, String[]> entry:parameterMap.entrySet()){
            System.out.println(entry.getKey()+"="+ Arrays.asList(entry.getValue()));
            //出现地址
//            System.out.println(entry.getKey()+"="+entry.getValue());
        }

       User user= WebUtils.copyParamToBean(req.getParameterMap(),new User());


        //2.检查 验证码是否正确 ===写死，要求验证码为abcde
        if(token!=null&&token.equalsIgnoreCase(code)){
            //正确
            //3.检查 用户名是否可用
            if(userService.existsUsername(username)){
                //不可用
                System.out.println("用户名"+username+"已存在");

                //把回显信息保存到request域中
                req.setAttribute("msg","用户名已存在");
                req.setAttribute("username",username);
                req.setAttribute("email",email);

                //跳回注册页面
                req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp);
            }else{

                //可用
                //调用service保存到数据库
                userService.registUser(new User(null,username,password,email));
                //跳到注册成功页面 regist_success.jsp
                req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req,resp);
            }

        }else{
            //把回显信息保存到request域中
            req.setAttribute("msg","验证码错误");
            req.setAttribute("username",username);
            req.setAttribute("email",email);
            //跳回注册页面
            System.out.println("验证码"+code+"错误");
            req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp);
        }
    }

}
